Method for computing accurate value of carbon equivalent of cast iron and application of method

A calculation method and technology of carbon equivalent, applied in the field of cast iron alloys, can solve the problems of not considering the content and function of trace elements, the inability to accurately control carbon equivalent, and the increase of shrinkage and porosity defects in castings, so as to eliminate genetic influences, improve internal quality, The effect of reducing internal shrinkage

Inactive Publication Date: 2014-08-13
SHANDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hereditary influence of these trace elements in the casting process makes it impossible to accurately control the carbon equivalent when batching, resulting in large fluctuations in quality
[0003] In general, the calculation of carbon equivalent in the casting production process only considers the role of C and Si, but does not consider the content and role of trace elements, which is called nominal carbon equivalent. The calculation result often differs greatly from the actual carbon equivalent and deviates from the eutectic point, resulting in castings Increased shrinkage defects

Method used

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  • Method for computing accurate value of carbon equivalent of cast iron and application of method
  • Method for computing accurate value of carbon equivalent of cast iron and application of method
  • Method for computing accurate value of carbon equivalent of cast iron and application of method

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Experimental program
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Effect test

Embodiment 1~3

[0016] Table 2 embodiment 1~3 spectrometer detection result

[0017]

Embodiment 1

[0019] In the present embodiment, its method is as follows:

[0020] a) According to the furnace charge ratio: 30% pig iron, 18% scrap steel, 52% returned iron, the molten iron is smelted by an induction furnace, and the mass fraction of carbon in the molten iron is detected by a spectrometer w(C), and the mass fraction of silicon w(Si ), the mass fraction w(M) of each element except iron in molten iron i , w(M) involved in this example i Including w(C), w(Si), w(Mn), w(P), w(S), w(Cu), w(Sn), w(Cr), w(V) and w(Mo) , the test results are shown in Table 2;

[0021] b) Establish carbon equivalent formula Among them, q is the graphitization tendency index of elements, which is 0 for elements that promote graphitization, and 1 for elements that hinder graphitization; n is the number of elements, and k is the graphitization degree coefficient of elements in molten iron; q, n, The k value is shown in Table 1, and the q, n, k values ​​and the mass fraction w(M) of each element m...

Embodiment 2

[0028] In the present embodiment, its method is as follows:

[0029] a) According to the furnace charge ratio: 40% pig iron, 18% scrap steel, 42% returned iron, the molten iron is smelted by an induction furnace, and the mass fraction of carbon in the molten iron is detected by a spectrometer w(C), and the mass fraction of silicon w(Si ), the mass fraction w(M) of each element except iron in molten iron i , w(M) involved in this example i Same as embodiment 1, the graphitization degree coefficient k of elements in the molten iron;

[0030] b) Establish carbon equivalent formula Among them, q is the graphitization tendency index of elements, which is 0 for elements that promote graphitization, and 1 for elements that hinder graphitization; n is the number of elements, and k is the graphitization degree coefficient of elements in molten iron; q, n, The k value is shown in Table 1, and the q, n, k values ​​and the mass fraction w(M) of each element measured in step a) i Subs...

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Abstract

The invention discloses a method for computing an accurate value of a carbon equivalent of cast iron and the application of the method and belongs to the technical field of cast iron alloy. According to the invention, influence of carbon, silicon and microelements on the carbon equivalent is taken into simultaneous consideration, the actual carbon equivalent of iron liquid is quickly and accurately calculated by using a mathematical modeling method, errors of theory and practice are obviously reduced, and furnace charge proportion or silicon iron addition can be timely adjusted in the production process, so the carbon equivalent approaches an eutectic point, and the casting performance and casting quality of the cast iron are improved.

Description

technical field [0001] The invention relates to a method for calculating the precise carbon equivalent value of cast iron and its application, belonging to the technical field of cast iron alloys. Background technique [0002] The iron-carbon alloy with eutectic composition has a narrow crystallization range, good fluidity of molten iron, easy feeding, and less tendency of shrinkage and porosity of castings. In production, the carbon equivalent of molten iron is usually controlled near the eutectic point to obtain high-quality castings. However, under the same carbon equivalent, pouring temperature and other conditions, when pig iron from different sources is used as raw material for casting production, the shrinkage and waste rate of castings fluctuates greatly, sometimes as high as 30%. The study found that the quality assurance indicators of foundry pig iron from ironmaking enterprises are five elements: C, Si, Mn, S, and P. The source of iron ore powder used in ironmak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25
Inventor 杨思一
Owner SHANDONG UNIV OF TECH
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